Chip@rochester.ARPA (11/13/86)
Two "technical" railroad questions: 1. How do in-cab block signal indicators work; that is, what signals are sent (I assume) through the rails for each of the possible signal indications? It must be in the rail and not openly transmitted, since trains in adjacent blocks must read different indications. I assume they are using some type of carrier-detect mechanism, with no signal detected being the most restrictive indication, but I would like to find out the specific frequencies and modulation types if that information is available. 2. On what frequencies do the new micro-cabooses operate, and how to they transmit the back-end pressure reading to the engines? I like to listen to the crewmen when they're building trains, and if possible, I'd like to be able to pick up and decode the signals from these new devices since they will be replacing the rear-end crew. Please mail responses directly to me, and I'll forward them to anyone else who's interested. Thanks! Chip Copper CSNET copper@bgsu.csnet N8ECQ UUCP ...!osu-eddie!bgsuvax!copper Department of Computer Science ARPA copper%bgsu@csnet-relay Bowling Green State University